test: add unit test for create_caster_fn_ident

2 files changed, 58 insertions, 0 deletions

diff --git a/test_util_macros/Cargo.toml b/test_util_macros/Cargo.toml
new file mode 100644
index 0000000..8848961
--- /dev/null
+++ b/test_util_macros/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "test_util_macros"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+proc_macro = true
+
+[dependencies]
+syn = { version = "1.0.96", features = ["full"] }
+quote = "1.0.18"
diff --git a/test_util_macros/src/lib.rs b/test_util_macros/src/lib.rs
new file mode 100644
index 0000000..aa87ecf
--- /dev/null
+++ b/test_util_macros/src/lib.rs
@@ -0,0 +1,47 @@
+#![deny(clippy::all)]
+#![deny(clippy::pedantic)]
+#![deny(missing_docs)]
+
+//! Internal macros used by tests.
+
+use std::iter::repeat;
+
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::parse::Parse;
+use syn::{parse_macro_input, LitChar, LitInt, Token};
+
+/// Repeats a character N number of times.
+#[proc_macro]
+pub fn repeat_char(input: TokenStream) -> TokenStream
+{
+    let RepeatMacroArgs { character, count } =
+        parse_macro_input!(input as RepeatMacroArgs);
+
+    let repeated = repeat(character.value()).take(count).collect::<String>();
+
+    quote! {
+        #repeated
+    }
+    .into()
+}
+
+struct RepeatMacroArgs
+{
+    character: LitChar,
+    count: usize,
+}
+
+impl Parse for RepeatMacroArgs
+{
+    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self>
+    {
+        let character = input.parse::<LitChar>()?;
+
+        input.parse::<Token![,]>()?;
+
+        let count = input.parse::<LitInt>()?.base10_parse::<usize>()?;
+
+        Ok(Self { character, count })
+    }
+}